I am experiencing issues with phone calls. I can receive and make calls fine but whenever I make a call to any number that has an auto attendant, I run into issues. When I'm on the phone and the auto attendant asks me to pick an option, no matter how many times I press the option, the phone does not recognize any input while on the phone. Is there anything I need to setup with GrandStream? My 3CX system is setup in 1 location with Yealink T26 and T28 phones. Also, the calls are routed through GrandStream GXW-4108.